Heat control for permanent-waving machines



Jan. 24, 1939. v p w FAIRCHILLD 2,144,965

HEAT CONTROL FOR PERMANENT-WAVING MACHINES Filed Sept. 2, 1936 WITNESS ATTORNEYS Patented Jan. 24, 1939 HEAT CONTROL FOR PERMANENT-WAVING MACHINES Dempsey W. Fairchild, Denver, Colo.

Application September 2, 1936, Serial No. 99,106

1 Claim.

This invention relates to heat control devices for permanent waving machines and has for an object to provide a current controlling rheostat device which will automatically vary the current supplied to the heaters during a heating or steaming operation, through a cycle which decreases from maximum to minimum and then is cut off whereby manual operation to properly control the current is entirely eliminated.

With the above and other objects in view the invention consists of certain novel details of construction and combinations of parts hereinafter fully described and claimed, it being understood that various modifications may be resorted to within the scope of the appended claim without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawing forming part of this specification,

Figure 1 is a side elevation of hair waving apparatus constructed in accordance with the invention.

Figure 2 is a diagrammatic view showing the electrical connections of the apparatus.

Figure 3 is a cross sectional view taken on the line 3-3 of Figure 1.

Referring now to the drawing in which like characters of reference designate similar parts in the various views, and referring more particularly to Figure 2, ll] designates an electric circuit adapted to be connected to the current supply lines H. A circuit I2 is supplied with current from the circuit Ill and a rheostat device l3 has its plurality of resistance coils I4 included in the circuit l2. The output lines l5 supply current to the heating coils it of the hair waving devices l1 which are as usual suspended from over head.

The switch contacts [8 of the rheostat device are arranged in a circular series concentric with the axis of rotation of a rotary contact arm l9 which forms one side of the circuit l2 so that as the arm rotates it has wiping contact in sequence with the contacts l8 and while in en- 45 gagement with any particular contact all of the coils l3 from that contact to the opposite side of the circuit constituted by the wire 20, will form a resistance in the circuit l2. Consequently, as the arm moves counter-clockwise toward 50 the switch contact 2| of the final resistance coil the resistance will gradually increase until the resistance of all the coils will be in the circuit which maximum resistance allows the minimum current to flow to the curler heating coils i6.

55 When the contact arm wipes over the initial switch contact 22 to begin another cycle the resistance of none of the coils will be in the circuit so that maximum current will flow to the curler heating coils. Thus a recurring cycle of current supply through a predetermined range 6 is effected, the duration of current supply being dependent upon the time period of wiping engagement of the arm I!) with any one of the contacts IS, the current being shut off while the arm is progressing from one contact to the next 10 succeeding contact.

One type of rheostat control apparatus suitable for carrying out the invention is illustrated in Figures 1 and 3 in which the coils I3 are helically wound upon an annulus 23 of insulat- 15 ing material. The annulus is clamped to an upright frame board 24 by means of a disc 25, the marginal edge of which overlaps the Winding of the annulus while the central portion of the disc is provided with screw bolts 26 which 20 secure the disc to the frame board 24. The switch contacts l8 may be in the form of plates of any suitable width which are disposed radially in the outer face of the disc at suitable distances apart in an annular series concentric 25 with the center of the disc, each plate being connected to the terminal winding of its associated resistance coil by a lead wire 21.

A stationary shaft 28 is journaled at one end in an opening in the frame board 24 and 30 at the opposite end is journaled in an opening formed in an upright bracket arm 29 which may be bolted to the base board 30 from which the frame board 24 rises, as shown at 3|. A sleeve 32 is loose on the shaft and is equipped 35 at one end with a worm gear 33 and at the other end the beforementioned contact arm I9 is fixed to the sleeve. The contact arm is formed of metal and terminates in a metal plate 34 which wipes over the switch contacts 18 as previously explained, when the sleeve is rotated by the worm gear 33.

A motor 35 or clock or spring is mounted on the base board 30, the driven shaft 36 thereof terminating in a Worm pinion 31 which meshes with the worm gear 33. The shaft is supported by bearing brackets 38 disposed on the bracket arm 29 on opposite sides of the worm pinion.

The motor circuit 39 is connected in series with the circuit H]. A switch 40 controls the circuit l0. A plug connector 40 of conventional type may be used to plug in the circuit H] with the line circuit H as illustrated.

The hair curlers I1, as best shown in Figure 1, are suspended from the horizontal arm 4| w of a bracket 42 which is provided at the base with lugs 43 adapted to straddle any suitable support 44 and be clamped thereto by means of a clamp screw which is passed through one of the-lugs 43.

Since the operation of the device has been described as the description of the parts progressed it is thought that the invention will be fully understood without further explanation.

What is claimed is:

A heat controlling device comprising a base plate, a frame rising from the plate, a bracket rising from the plate, a shaft supported at the ends in the bracket and the frame, a sleeve on the shaft,'a radially disposed contact arm on the sleeve, a worm gear fixed to the sleeve for rotating the contact arm, a rheostat comprising an annulus of resistance coils coaxialwith the shaft, a clamp disc having its edge overlapping the annulus, bolts passed through the disc and frame for clamping the disc and the annulus to the frame, an annular series of switch contacts on the disc coaxial with the annulus, lead wires connecting the resistance coilsof the annulus with respective ones of the switch contacts, said contact arm being adapted to wipe over said switch contacts in succession, a heating circuit including the resistance coils of the annulus and the contact arm, a driven shaft terminating in a worm pinion engaging said worm gear for continuously rotating said contact arm to engage said switch contacts and control the resistance of said circuit from minimum resistance to maximum resistance and provide a recurring cycle of current supply through a predetermined range.

DEMPSEY W. FAIRCHILD. 

